printman2000
Engineer
Not all of them can as the Quicktrack machines have not been able to. Either way, I still believe it is using the camera to scan.I suspect the iPhones they are using actually use the camera to read bar codes and not a red laser like the Quicktrak and other bar code scanners. That way it can be read off of screens.
Lasers can read bar codes off phone screens just fine, as I can tell you from successfully using a code on my iPhone screen to board airplanes. (Jis mentioned the same, earlier in this thread.)